Antiskidding device.



T. B. THOMAS.

I ANT'ISKIDDING DEVICE. APPLICATION FILED FEBJZ,

PatentedNov. 11, 1913.

@MAM/vm! Ait UNITED srarmgg PATENT orrion.

THEODORE B. THOMAS, OF QUINCY, MASSACHUSETTS.

ANTISKIDllING DEVICE.

Specification of Letters Patent.

.Application led February 12, 1913.

Patented New, i i, m13. Serial No. 747,879.

To all whom, t may concern Be it known that I, Tiiaooonn B. THOMAS,

`a citizen of the United States, residing at Quincy, in the county of Norfolk and State -pf Massachusetts, have invented an Improvement in Antiskidding Devices,` of which the following is a specification.

This invention relates to anti-skidding devices for automobiles and the like, involving the employment or' a pair of ground-engaging devices arranged adjacent thetraction-wheels. The groundngaging deviceseach comprise a disk for engagement with the ground, and the invention has for its object the provision of strong and durable supports for the disks, of an improved form, as hereinafter described and claime' which admit of movement of the disks up and down while in engagement with `the ground, and also a movement of the disks into and out of engagement with the ground, my improvements being directed mainly to greatly increasing the strength and durability of the supports.

Figure l is a side elevation of one of the ground-engaging devices, it being represent ed in t'ull lines in engagement with the' ground and in dotted lines out of engageinent with the ground. Fig. Zi's a front. eleiyation of a pair of groundengaging devices, and, Fig. 3 is a longitudinal vertical section of one of the disks and its axle.

For the purpose of illustration the support forthe ground-engaging devices is represented at 10, and the traction-wheels at 12. The groundengaging devices here shown are made substantially alike, al-

though their relativepostions with respect iol to the end of the stub-axle.

'ing arm 21eispivoted at its upper end to a to the wheels are reversed, so that both are arranged at the inside of the wheels. A description of one will sulllce.

15 represents a disk of any suitable con-i' struction having a stubaxle 16, preferably formed integral with it. The stub-axle extends through and has its bearing in the loweroifset end portion 20 of a supportingarm 21, and is held in place by a collar fixed Said supportclevis 23, which is in turn pivotally connect ed to a clainp, which embraces the sup ort( 10. The pivots of the arm and of the c evis are arranged at right angles to each other,

so that the arm has a movement up and down with respect to the, .ground and-the clevis vhas a movement forward andbackward. The clamp here shown is composed `oi two clamping-members 25 and 26 ada ted to embrace the support 10, said mem ers being bolted or otherwise secured together, yet any other form of clamp may be e1n ployed. The clevis is here shown as pivot ally connected to the forward end of one of the. clampingmembers.

The supporting-arm 21is guided in its vertical' movements and. is additionally sup ported by the guiding and support-ing member, here shown as a slotted bar 30, pivotally connected at its upper end to another clamp arranged on the support l0. The supportf 1ng-arm is arranged'in the slot of said `member and is movable up and down therein.

The pivotal connection of said bar 30 with 4 l its clamp is the sameas the pivotal connection of the clevis with its clamp, hence` said bar ismovable forward and backward the same as the clevis, thereby permittirg the and supporting-arm to be moved forwar backward. For simplicity of constructipn the pivot-bolt may extend through he the slotted bar. In case the weight of the disk and supporting-arm bearing it are not suflicientto hold the disk" in engagement forward extremities of both clamps and u serve as the pivot for both the clef/island.

with the ground a springe() may be placed in the slot of the bar 30, which engages the supporting-arm with a yielding pressure. The supporting-arm has an eye 45 or equivalent for connection with a rod by which 4the bar is: moved forward,l and' backward, theie by moving the disk into and out of engagement with the ground.

l claim :M vIn an antiskidding device, a ground-en gaging device consisting of a disk haviiilg a 'set stub-axle, a supporting-arm havmg an o lower end-portion through which said st-ubaxle extends and which serves a'sa bearing T therefor, a clcvis to which the upper end of the supporting-arm is pivotally connected,

a clamp to `which said clevis is pivotallyconnected, ya slotted guiding and support.,

ing-member for said support1ng-arm and a Q Lof/wo@ 'clan-np to which the upper end of said mzoln testimony whereof, I have Signed my ber is pvotaly connectod, the pivotal oonname to this speccatlon, in the presence 10 nections of the Clovis and slotted member of two subscribing Witnesses.

with their clamps permtng forward and backward movement of the supporting-arm THEODORE B THOMAS' to move the disk out of and into engage- Witnesses: ment with the ground, substantially as d- H. B. DAVIS,

scribed. i B. J, Noms,

Gopies of this patent may be obtainedfor five cents each, by addressing the Commissioner of :Patentsj Washington, D. C. 

